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[AArch64] Lower INSERT_SUBVECTOR to LD1_POST
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Authored by asavonic on May 21 2021, 11:51 AM.
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Summary

Before this patch, (insert_subvector (scalar_to_vector) lane) and an
ADD used to generate LDR + INS + ADD (or an offset for a subsequent
LDR). Now this is folded into a single LD1_POST instruction.

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